Half-hourly energy analysis for UK businesses
Stop paying for empty buildings.
Your electricity meter records what your building uses every half hour, including every hour you’re closed. WattGuard reads a year of that data and shows what those empty hours cost you, in pounds, at your own tariff.
Nothing to install · Nothing to sign · Independent, not a broker
Independent. Not an energy broker. No supplier commission.
ICO registered. Ref. ZC221784
UK-hosted. AWS London, encrypted at rest and in transit
Traceable. Every figure links back to its half-hour
Watt Labs Ltd. Nottingham, company no. 17384389
The cost of closed hours
You're paying for it every night.
Most buildings never fully switch off. None of it appears as a separate line on your bill, so nobody sees it. It's there in your meter data, every half hour.
Plant on an old schedule
Heating, cooling and ventilation still timed for opening hours that changed years ago.
Kit left on standby
Kitchen, bar and AV equipment left idling overnight.
Closures the building doesn't know about
Bank holidays and the Christmas shutdown, with everything running as if it were a Tuesday.
How it works
Three steps. Nothing to install.
01
Send your data
Download 12 months of half-hourly data from your supplier's website and email it to me. Tell me who your supplier is and I'll send step-by-step instructions. If you get stuck, send a screenshot and I'll talk you through it.
02
I cost every closed half-hour
I separate the hours your building is in use from the hours it isn't, and price each half-hour at the rate that applied to it. That's 17,520 half-hours per meter, per year.
03
You get a plain-English report
What your building draws when it's closed, what that costs a year, and where to start. Every figure traces back to the half-hours it came from. Within 2 working days of your file arriving.
I find it. I price it. You fix it.
No disruption
Getting started is simple.
No hardware.
ZERO works on data your meter already records.
No site visit.
Everything is done remotely.
Nothing to sign.
No letter of authority. You send your own data.
No supplier switch.
Keep your current contract.
No commission.
I'm not a broker, and I earn nothing from energy suppliers.
17,520
half-hours costed per meter, per year
0
things to install for ZERO
2
working days from your file to your report
£0
commission from energy suppliers
What you get
Every figure traced back to the half-hour it came from.
No black box and no guesswork. Each pound in the report links to the readings behind it, so you, your finance director or your auditor can check it.
Sample site: visitor attraction, open 10:00–17:00
Out-of-hours cost: £26,105 a year
| When | Cost a year | Source |
|---|---|---|
| Evenings after close, 17:00–23:00 | £12,527 | 4,380 half-hours |
| Overnight, 23:00–06:00 | £6,745 | 5,110 half-hours |
| Before opening, 06:00–10:00 | £6,833 | 2,920 half-hours |
Each half-hour costed at the rate that applied to it.
Why WattGuard
What your current tools don't show you.
Your supplier's account shows how much you used. A dashboard shows a line. Neither tells you what the hours you're closed are costing, or where to start.
| Supplier online account | Broker energy review | Sensor monitoring platform | WattGuard ZERO | |
|---|---|---|---|---|
| Works on data you already have | Yes | Yes | No, sensors fitted first | Yes |
| Shows what closed hours cost, in pounds | No, totals only | Varies | If someone reads the dashboard | Yes |
| Independent of your supply contract | n/a | Often linked to a new contract | Yes | Yes |
| Tells you where to start | No | Varies | You interpret it | Yes, ranked in the report |
| Every figure traceable to source data | No | Varies | Varies | Yes |
Need to know which piece of kit is responsible? That’s what WattGuard SENSE is for.
Products
Start with ZERO. Go further when you need to.
Find it
WattGuard ZERO
See what your building costs when it's closed.
Uses the half-hourly data your meter already records. Nothing installed, nothing to sign.
Includes
- Out-of-hours usage, costed half-hour by half-hour
- Exposure to peak-rate (red-band) periods
- Plain-English report within 2 working days
Pinpoint it
WattGuard SENSE
Find out which piece of kit is doing it.
Wireless sensors on the circuits that matter, with live readings compared against your building's normal pattern. When something runs when it shouldn't, the right person gets an alert.
Includes
- Readings by circuit and by machine
Prove it
WattGuard CERTIFY
Compliance paperwork built from your own data.
Drafts an ISO 50001 energy review from your metered data and bills, with every figure cited to its source. It gives your ESOS lead assessor and your SECR report evidence they can check.
Includes
- ISO 50001 energy review drafts
- Evidence for ESOS and SECR reporting
- Every figure cited to source data
Who it's for
Built for buildings that close.
Hotels and restaurants
Kitchen extraction and dishwashers running long after service. Function rooms heated with nobody booked.
Golf clubs
Clubhouse heating and hot water through the night. Bar and catering kit on standby between shifts.
Leisure centres and gyms
Saunas and steam rooms heating after the last session. Pool hall plant with no night setback.
Museums, theatres and heritage
Gallery lighting, AV and interactives left on. Offices and front of house heated on dark days.
Businesses with several sites
Every site costed the same way, so you can see which ones run hot overnight.
Some of it has to stay on: cellar cooling, collections care, security. The report shows what runs while you’re closed and what it costs, so you can decide what doesn’t need to.
Who you'll deal with
One specialist, start to finish.
WattGuard is an independent practice. The person who reads your data, runs the analysis and writes your report is the person you speak to. If your building is already well run, I'll tell you, in writing.
Edward Mellor, PhD
Watt Labs Ltd, Nottingham
Designed sensor systems for smart buildings and industrial sites, then data and AI infrastructure for large smart-city developments.
Pricing
A fixed price before any work starts.
Every building is different, so the price depends on the site and what the analysis is likely to be worth. Tell me about yours and I'll give you a figure up front.
- Priced per site
- Figure agreed before any work starts
- No obligation
Quick check
What do your closed hours cost?
Three numbers and you'll have a rough figure.
Find your lowest half-hour reading overnight and double it. 6 kWh in a half-hour = 12 kW.
Open 10:00–17:00 every day = 119 closed hours.
It's on your bill.
£15,470
a year spent on power while you’re closed
This is what your closed hours cost, not a savings estimate. Some of it has to stay on. The audit shows how much, costed at the rate that applied to each half-hour.
Questions
Common questions
Get started
Find out what your empty hours cost.
Send a year of half-hourly data and get a plain-English report within 2 working days. Or book a 15-minute call first. It's informal, there's no obligation, and it's about your building.
01
Tell me about your site. It takes two minutes.
02
I send instructions for getting your data, and a fixed price.
03
Your report arrives within 2 working days of your file.
Rather write than talk? Send me a message and I'll reply by email.